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jkkitakita

Notion Uploader MCP

by jkkitakita

upload_to_notion_at

Upload a file to a Notion page and insert it as an image or file block after a placeholder token or a specific block ID, or attach as cover/icon.

Instructions

Upload a file and insert an image/file block immediately AFTER a placeholder or a specific block_id

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
captionNoCaption for the uploaded file
block_idNoAppend after this block ID directly
propertyNoDatabase 'files' property name (attach to a property instead of appending a block)
attach_asNoAttach as an image/file block, or page cover/iconimage
file_pathYesAbsolute path to the file to upload
placeholderNoAnchor token placed in the document (e.g. {{IMG_PLACEHOLDER:1:slug}})
page_id_or_urlYesNotion page ID or page URL (NOT a database view URL)
remove_placeholderNoIf true and placeholder mode, delete the placeholder block after inserting
Behavior2/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

With no annotations, the description must disclose behavioral traits, but it only states it uploads and inserts. It omits side effects such as placeholder removal (despite the remove_placeholder parameter), permission needs, or failure behavior. This is insufficient for a mutation tool.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness5/5

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is a single, front-loaded sentence that captures the core action without extraneous words. It is highly scannable and efficient.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness2/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

The tool has 8 parameters and no output schema or annotations, yet the description provides minimal context. It fails to mention attach_as modes, property attachment, or placeholder removal, forcing the agent to rely entirely on the schema without high-level guidance.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters3/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema description coverage is 100%, so the baseline is 3. The description does mention placeholder and block_id conceptually, but the schema already provides detailed descriptions for all parameters, and the description adds no extra semantic value.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose5/5

Does the description clearly state what the tool does and how it differs from similar tools?

The description states a specific action: uploading a file and inserting a block after a placeholder or block_id. It clearly distinguishes from the sibling 'upload_to_notion' by adding the positional 'after' behavior.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines3/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

The description implies its purpose (inserting at a specific location) but does not explicitly state when to use it over 'upload_to_notion' or provide alternative references. No guidance about exclusion scenarios is given.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

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